A mother and three children were killed in an eight-vehicle pile-up in Berkshire on Wednesday.
Tracy Houghton has been named locally as the 45-year-old woman who died in the crash on the A34 yesterday.
Her two sons Ethan, 13, and Joshua, 11, along with an 11-year-old girl, were also in the vehicle and died in the fatal collision.
A 30-year-old man from Andover was arrested on suspicion of causing death by dangerous driving and has been bailed until 5 October.
The crash involved four heavy goods vehicles and four cars on the A34, near East Ilsley.
Thames Valley Police officers were called shortly after 5.10pm to reports of a crash on the northbound carriageway between the East Ilsley and West Ilsley junctions.
South Central Ambulance Service also attended the scene.
One man was flown by air ambulance to the John Radcliffe Hospital, where he is still being treated for serious injuries.
A man and a teenage boy were taken to the Royal Berkshire Hospital by land ambulance with minor injuries and have since been discharged.
Nine people sustained minor injuries and were treated at the scene, police said.
The northbound carriageway of the A34, between Chieveley at junction 13 of the M4 and between the West Ilsley junction was closed over night until about 6.30am today.
Chief Inspector Henry Parsons, head of the Joint Operations Unit for Roads Policing, said: “Our thoughts are with anyone affected by this tragedy.
“Can I ask anyone who witnessed the collision, including anyone travelling on the southbound carriageway who saw anything they believe is significant, to contact police.”
Anyone with any information that could help officers with the investigation is asked to call the 24-hour Thames Valley Police enquiry centre on 101 quoting URN 1109 10/8.